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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 592842, 7 pages
http://dx.doi.org/10.1155/2012/592842
Research Article

Surface Plasmon-Enhanced Nanoantenna for Localized Fluorescence

Department of Electrical and Electronics Engineering, Yeditepe University, 34755 Istanbul, Turkey

Received 6 September 2012; Revised 5 December 2012; Accepted 6 December 2012

Academic Editor: Cheng Wei Qiu

Copyright © 2012 Isa Kocakarin and Korkut Yegin. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Surface plasmon-enhanced gold nanoantenna structures on glass substrate are studied for increased localized electric field and fluorescence at the feed gap locations of the antennas. Dipole, Archimedean balanced spiral, and bowtie and double bowtie geometries are studied for surface plasmon effect. Different flare angles for bowtie geometries are compared to each other. Double bowtie geometry with dual polarization capability exhibited superior performance with almost 56 dB field enhancement factor. We also studied the effect of substrate thickness on electric field enhancement and we found that glass thickness plays a critical role for coherent addition of surface plasmons at the feed gap location. The surface plasmon effect is proven by considering perfect electric conductor model of gold instead of its modified Drude model.